/***************************************************************************
 *   Copyright (C) 2008 by Eduardo Gurgel Pinho                            *
 *   edgurgel@gmail.com                                                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
***************************************************************************/

#ifndef __LIGHT_H__
#define __LIGHT_H__

#include "material/light_material.h"
#include "math/vector.h"
#include "math/ray.h"
#include "common/random_generator.h"

#include <boost/serialization/is_abstract.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/version.hpp>
#include <boost/tuple/tuple.hpp>

using namespace boost::tuples;

namespace Sirat {

namespace Light {

class Light {
public:
	virtual ~Light();

	void set_material(Material::Light_Material* const _light_material);
	Material::Light_Material* get_material();
	
	virtual tuple<Math::Vector*,unsigned int> get_sample_points() const = 0;
	virtual tuple<Math::Vector*,unsigned int> get_sample_points(const Common::Random_Generator& _random_generator,const unsigned int _n) const= 0;
	virtual Math::Ray* get_sample_directions(const Common::Random_Generator& _random_generator,const unsigned int _n) const = 0;
	
	virtual Light* clone() = 0;
protected:
	Light();
	Light(Material::Light_Material* const _light_material);
	Light(const Light& _light);
	
	Light& operator=(const Light& _light);
	
	Material::Light_Material* light_material;
private:
	friend class boost::serialization::access;
	template<class Archive> void serialize(Archive&, const unsigned int);
};

template<class Archive> void Light::serialize(Archive& ar, const unsigned int /* file_version */){
	ar & BOOST_SERIALIZATION_NVP(light_material);
}

}

}

BOOST_IS_ABSTRACT(Sirat::Light::Light)

#endif
